Recent data from the China CDC’s weekly report indicates a rise in influenza activity in southern China. Experts predict this year’s flu season may arrive earlier, and the circulating strain differs from last year’s.

How can we protect ourselves scientifically, and which vaccine should we choose?

Characteristics of This Year’s Flu

Countries such as Japan, the UK, Germany, and Italy have reported significant increases in flu cases. Many experts suggest the flu season may arrive early, potentially leading to more infections.

This year’s dominant strain is Influenza A (H3N2), whereas last year’s was Influenza A (H1N1). As a result, the general population may have lower immunity to H3N2, making vigilance essential.

Symptom Identification
The common cold typically involves upper respiratory symptoms like nasal congestion, runny nose, and sneezing, with mild systemic symptoms. In contrast, sudden high fever, body aches, fatigue, and headaches may indicate influenza.

Influenza Vaccine Protection

1. Timing for Vaccination
   The recommended vaccination period is September to November. It generally takes 2 to 4 weeks after vaccination for protective antibodies to develop. These antibodies can provide protection for 6 to 8 months against similar strains. If vaccination is delayed, it can still be administered anytime during the flu season.

2. Annual Vaccination Needed?
   Yes. Influenza viruses mutate rapidly, and the circulating strains can change each year. Annual vaccination ensures up-to-date protection against the current season’s strains.

3. Five High-Risk Groups Should Prioritize Vaccination

• Chronic respiratory diseases

• Cardiovascular diseases (excluding hypertension)

• Kidney, liver, or blood disorders

• Neurological or neuromuscular diseases

• Metabolic or endocrine disorders

• Malignancies

• Immunosuppression

• Children under 5 (especially those under 2)

• Adults aged 65 and older

• Obese individuals

• Pregnant and postpartum women

• Individuals with underlying conditions, such as:

4. Trivalent vs. Quadrivalent Vaccines

• Trivalent: Covers 2 Influenza A strains (H1N1, H3N2) + 1 Influenza B strain.

• Quadrivalent: Includes an additional Influenza B strain, though this strain has not been prevalent recently, making the protective effect similar.
  Recommendation: Don’t hesitate over the type—get vaccinated as soon as possible!

Special Considerations for Children
Children, especially those under 5, are prone to high fever and complications after flu infection. Close monitoring is essential.

Care Tips: Ensure adequate hydration, nutrition, and rest. Keep living spaces well-ventilated. Seek medical attention promptly if symptoms persist or if a high fever continues.

Stay Protected: Get Vaccinated Early, Test Timely!